Construct a circle with a 4.5 radius. The circle's circumference is 360 degrees. So mark out 3 by 120 degrees on the circumference and join them to the centre of the circle which will divide the circle into three equal parts.
Circumference = pi ( 3.1416, a constant) * diameter = 3.1416 * 38.2 = 120 sq. units
360 degrees in a circle 120 degrees = 12mm 360 degrees = 36mm Therefore the circumference of the circle is 36mm.
A central angle of 120 is one third of the circle, so the arc length of 28.61 is one third of the circumference. 28.61 X 3 = 85.83
Circumference will be 120 pi inches, ie 31 feet and very nearly 5 inches
Circumference equals pi multiplied by diameter. Therefore 120 (circumference) divided by pi equals diameter. Pi is on your calculator.
Diameter of the circle: 120/pi = 38.197 inches rounded
Construct a circle with a 4.5 radius. The circle's circumference is 360 degrees. So mark out 3 by 120 degrees on the circumference and join them to the centre of the circle which will divide the circle into three equal parts.
Circumference = pi ( 3.1416, a constant) * diameter = 3.1416 * 38.2 = 120 sq. units
360 degrees in a circle 120 degrees = 12mm 360 degrees = 36mm Therefore the circumference of the circle is 36mm.
A central angle of 120 is one third of the circle, so the arc length of 28.61 is one third of the circumference. 28.61 X 3 = 85.83
Since diameter is twice its radius, the radius of this circle would be 60
Circumference will be 120 pi inches, ie 31 feet and very nearly 5 inches
First we have to find the radius: pi*radius2 = 120 sq ins Divide both sides by pi and then square root both sides: radius = 6.180387232 inches circumference = 2*pi*radius circumference = 38.83251825 or 39 inches to the nearest inch.
Estimate: 3*40 = 120 inches Actual: pi*39 = 122.5 inches to one decimal place
Divide the circumference by the value of Pi and divide the result by 2 - that will give you your answer.
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